Design a temperature-controlled fan using ATmega32 microcontroller,
in which the fan is automatically turned ON or OFF according to the
temperature.
Use ATmega32 Microcontroller with frequency 1Mhz.
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LM35 temperaturesensor will give continuous analog output corresponding to the temperature sensed by it. This analog signal is given to the ADC, which converts the analog values to digital values. -
The digital output of the
ADCis equivalent to sensed analog voltage. -
In order to get the temperature from the sensed analog voltage, we need to perform some calculations in the programming for the microcontroller.
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Once the calculations are done by the microcontroller according to the logic, the temperature is displayed on the LCD.
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The microcontroller will continuously monitor the temperature and based on the temperature value, Microcontroller will drive the fan like that:
| Temperature (C) | Fan State | Fan Speed (Percentage from Max) |
|---|---|---|
| Less than 30 | OFF | 0 % |
| Greater than or equal 30 | ON | 25 % |
| Greater than or equal 60 | ON | 50 % |
| Greater than or equal 90 | ON | 75 % |
| Greater than or equal 120 | ON | 100 % |
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The main principle of the circuit is to switch on/off the fan connected to
DC Motorbased on temperature value. The DC-Motor rotates inClock-Wisedirection or stopped based on the fan state. -
The LCD should display the temperature value and the fan state continuously like that:
- Control the DC-Motor speed using PWM signal generated from Timer0.
| Software Layered Model | Driver Name |
|---|---|
| Application Layer (APP) | Fan_Controller.c |
| Hardware Abstraction Layer (HAL) | LCD / LM35_Sensor / DC Motor |
| MicroController Abstraction Layer (MCAL) | GPIO / ADC / PWM |
To deploy this project
Install the Following Software:
